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One of my car mods was to decrease the idle of the car which gave a fairly good improvement (about 20 % when idling)
I turned down the idle control screw (the mechanical idle control) which sets the lowest the idle will go to
Then i also put a switch in the cabin to stop the ECU increasing the idle using the IAC valve mentioned in past posts. This ended up being a switch which put the ECU into a "diagnostic/tunning" mode which is used to tune the idle. I found that it just caused the ECU to stop compensating for low idle
So now when i get to stop lights or when im in neutral coasting i will flip the switch and my idle will go down really low to about 600 rpm (probably lower than it should) but engine hasn't stalled yet and it also has not damaged itself from bad lubrication either although it is probably shortening the life a bit.
this might be worth doing if your finding your idle is particularly high in neutral
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